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Rxte Observations of a New X-Ray Transient: GRS 1737-31 | | Wei Cui
; W. A. Heindl
; J. H. Swank
; D. M. Smith
; E. H. Morgan
; R~.Remillard
; F. E. Marshall
; | | Date: |
8 Jul 1997 | | Subject: | astro-ph | | Affiliation: | MIT, UCSD, GSFC, UC-Berkeley | | Abstract: | We present the results from RXTE observations of a new X-ray transient, GRS 1737-31, near the Galactic center during an outburst. Over a span of two weeks, the source was seen to vary significantly on time scales down to a few seconds. The rapid flares in the light curves bear resemblance to those observed for Cygnus X-1, a well-known black hole candidate (BHC). The power-density spectrum is also very typical of BHCs in the HARD (or LOW) state: it is flat below a characteristic break frequency of ~0.03 Hz, and becomes roughly a 1/f power law above. The observed X-ray spectrum can be characterized by a simple power law with a photon index of ~1.7 over a broad energy range 2-200 keV, which is remarkably similar to that of Cyg X-1 in the HARD state. The similarities to Cyg X-1 make GRS 1737-31 a likely BHC. However, unlike most transient BHCs, GRS 1737-31 does not seem to reach a ``soft state’’ even during an outburst. We discuss this phenomenon in light of the comparison to a class of hard X--ray BHCs including transients GRO J0422+32, V404Cyg and GRO J1719-24, and persistent sources 1E1740.7-2942 and GRS 1758-258. | | Source: | arXiv, astro-ph/9707096 | | Services: | Forum | Review | PDF | Favorites | |
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